Final answer:
Drill Sergeants execute the rehabilitation program for soldiers as instructed by a Physical Therapist, following military guidelines, as PTs have advanced training and often specialize in sports injuries.
Step-by-step explanation:
Drill Sergeants (DSs) conduct the Trainee/Soldier's rehabilitation program based on guidance from the Physical Therapist (PT) and in accordance with FM 7-22, APRT. When soldiers have a muscle or joint injury, they are usually referred to a Physical Therapist after initial assessment by their regular doctor. PTs are required to have a master's degree or doctorate, making them highly knowledgeable in the field of body mechanics. Not only are they experts in understanding how the body moves, but many also have a specialization in treating sports injuries, which is particularly relevant in a military training context where such injuries are common.